Ball bearing swivel bases feature dual rows of Delrin ball bearings that swivel freely even underhigh loads. Bases include stand-up springs and a U-adaptor to accept a variety of appropriate blocks. The 144 is the standard configuration with a tall arm. It is ideal for mounting in the cockpit or for use on larger keelboats and small offshore boats that use 3.00 in (76 mm) plastic blocks. Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.

Height (mm)146 mm
Height (in)5 3/4 in
Weight (g)369 g
Weight (oz)13 oz
Minimum line Ø (mm)3 mm
Minimum line Ø (in)1/8 in
Maximum line Ø (mm)12 mm
Maximum line Ø (in)1/2 in
Fastener spacing (mm)19 mm
Fastener spacing (in)3/4 in
Fasteners (mm)5 FH mm
Fasteners (in)#10 FH in
Use with57 mm/75 mm/2.25"/3.00"/ratchets